Square D HJA36150U44X - 150 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D HJA36150U44X is a 150 A, 600 V, 3-pole plug-in molded case circuit breaker designed to protect panelboards and load centers from overcurrent and short circuits. Built for dependable, fast replacement and reliable performance, this unit keeps electrical systems running smoothly with minimal downtime.

• Fast plug-in connection — streamlined installation and quick swap-outs, reducing service time in crowded electrical enclosures.
• Thermal-magnetic trip unit — delivers stable, repeatable protection by combining precise thermal sensing for overloads with magnetic tripping for high fault currents.
• 3-pole design for 3-phase circuits — ideal for commercial and light industrial applications where three-phase protection is required.
• OEM-compatible mounting — engineered to integrate with matching Square D load centers and panelboards for a seamless, coordinated protection solution.
• High-current, high-voltage capability — 150 A rating with a 600 V maximum, suitable for demanding branch circuits in diverse settings.

Who should consider this breaker? electrical contractors, facilities managers, and system integrators responsible for service panels in commercial spaces, light industrial facilities, and multi-residential developments. It’s the reliable choice when you need to safeguard critical circuits against overloads and short circuits, reducing downtime and preventing equipment damage.

• — replacing aging or failed breakers in 3-phase panelboards to restore protection quickly.
• Use case: new installations — integrating into new or upgraded load centers that require robust, plug-in protection for large branch circuits.
• Use case: service panel upgrades — upgrading to a higher-current, 3-pole solution for improved performance and expansion capacity.

Technical snapshot

• Square D
• HJA36150U44X
• Thermal-magnetic molded case circuit breaker
• 150 A
• 600 V
• 3
• Plug-in
• Branch circuit overcurrent and short-circuit protection